Scrap chopper with a blade having a combined rotary and reciprocating motion



p 10, A. R. CARR 2,214,160

SCRAP CHOPPER WITH A BLADE HAVING A COMBINED ROTARY AND RECIPROCATINGMOTION Filed July 22, 1938 2 Sheets-Sheet l p 1940- A. R. CARR 2,214,160

SCRAP CHOPPER WITH A BLADE HAVING A COMBINED ROTARY AND RECIEPROCATINGMOTION Fil ed July 22, 1958 2 Sheets-Sheet 2 Patented Sept. 10, 1940SCRAP CHOPPER A BLADE HAVING A COMBINED ROTARY AND BECIPRO- CATINGMOTION Arthur Robert Carr, Gary, Ind. Application July 22, 1938, SerialNo. 220,817

3Claims. (Cl.'164-68) The present invention relates to a reciprocatingscrap chopper.

An object of this invention is to provide a 'cutting mechanism-formetallic scrap material in which the cutting may be done over aconsiderable length of the knife.

Another object of this invention is to control the reciprocatingmovement of the scrap chopper.

Other objects andadvantages will become apparent from the description,when read in connection with the accompanying drawings, in which:

Figure 1 is a p n of the present invention; Figure 2 is a side elevationof the showing in Figure 1;

Figure 3 is asection on'line BIL-Ill. of Figure Figure 4 is a section'online IV-IVof Figure Figure 5 is a side elevation of the scrap chopperadjustment head; and,

Figure 6 is an end view of the showing in Figure In the drawings. thenumeral 2 represents a 26 conventional type of side-trimming shearprovided with conventional type of cutting knives 3 adapted to trim theedges of strip and the like material.

The scrap chopper of the present invention, which is used in conjunctionwith a conventional type of side-trimming shear 2, comprises astationary cutter knife 4 and a rotary cutter knife 5. Mounted upon abase 6, and secured thereto, is a. bed-plate I having an upwardlyextending flange 8 and tongue member 9, upon which a slide.

plate In is adapted to move back and forth. The slide plate I! isprovided with a flange l2 adapted to slide on the base plate 1 and agroove ll adapted to slide on said tongue member 9.

4o Rigidiy secured. in any desired manner, to the side plate I0 is ahousing l5 which supports the stationary and rotary cutterblades, in anycon- ;ventional manner. A spline shaft l3, receiving power from a maindrive shaft i'l, drives the 5 rotary cutter knife 5 and is mounted insuitable bearings ll, of' conventional design, between which issupported a pulley-wheel l9 having grooves to receive the V-belts' 20 toreceive power fronrthe pulley-wheel 2|, which is mounted on 50 a powershaft 22. A sprocket-wheel 23 mounted upon the end of said shaft 22 isconnected by sprocket chain 24 to asprocket-wheel 25 mounted on a shaft26 of a speed reducer unit 21.

v A low speed shaft 23 extends from the speed 55 reducer and has keyed.01 otherwise secured thereon a face plate 29. The face plate, 29 isprovided, on one face thereof,, with a groove 33 within which is adaptedto slide, upon an adjusting screw 3|, a block 32. Extending from saidblock 32 is a crank-pin 33 on which is pivotally 6 mounted aconnecting-rod 34. said connectingrod being pivotally connected at itsother end to said housing -l5. r

The reciprocating housing i5 is provided on the side adjacent thecutting knives 3 with a 10 transversely extending elongated opening orguideway 35. Rigidly secured, in any conventional manner, within theguideway 35 is a boxlike member or guide extending upwardly from thereciprocating housing I! to a point adjacent 15 the edge of the cuttingknives 3 in order that the scrap material coming from the edges of thesheet or plate will be positively guided into contact with the scrapchopper.

The operation of the present invention is a follows: v

As strip material is fed to the trimming shear 2, the knives 3 shear orcut oil! the edges of the strip or material to the desired width, andthe scrap from the edges passes through a box-like a guide member 40into the guideway 33 into contact with the scrap chopper. The scrapmaterial is then cut up into short lengths or pieces by the rotation ofcutter blades 5 coacting with the stationary cutter blade 4. The speedreducer 3 unit, receiving power throughythe chain and sprocketmechanism. 23, 24 and 2I, drives the shaft '23 carrying the face plate23, and, due to the movement of the crank pin 33 mounted'on theadjustable slide bliflk 32, moves the con- 35 necting-rod 3| and thehousing l6 containing the rotary and stationary cutter blades back andforth across the path of the scrap material coming from theside-trimming shear 2. This reciprocating movement of the scrap chopper4 permits cutting of the scrap material over a considerable length ofthe knife, and greater service is obtained from the knives between theperiods necessary for grinding. j By adjusting the screw 3|, the extentof the reciprocating movea meat of the scrap chopper is controlled inthat movement of the adjusting screw 3| produces a movement of'saidblock 32 thereon with the result that the connecting-rod 34, which ispivotally connected to the crank pin 33 and the housing I! regulates thereciprocating movement of the scrap chopper and aflords an opportunityofvarying, over a wide range, the points to which the scrap material willbe engaged 'by the coacting rotary cutter and stationary cutter blades.3

In the scrap chopper now in use, the blades have no reciprocatingmovement and the scrap material contacts the cutter blades atsubstantially the same point all the time, which results in theknivesbecoming dull at the point of cutting. This requires considerableexpense incident to resharpening oi the knives. Under the presentinvention, these difliculties are over- In a construction as hereinabovedescribed, the reciprocating chopper unit is located very close to thecutting knives 3 and, due to this decrease in the distance between thecutting knives and the scrap chopper unit, whipping movement oi thematerial is minimized and cobbling oithe scrap material is preventedthereby. This eliminates any tendency to burn the cutting knives 3 dueto the possibility of cobbling of the scrap material.

I fixed and rotary cutter blades supported by said carriage and movabletherewith transversely of the scrap, whereby wear on the cutter bladesis distributed over a considerable portion of the length thereof so thatthe frequency of resharpening said cutter blades is minimized.

2. The combination with a side-trimming effective to cut off anelongated piece of scrap from material ted thereto, of means forchopping said scrap into smaller pieces comprising a carriage, means foradjustably reciprocating said carriage transversely of the line oftravel of the scrap ejected by the shear, coacting fixed and rotaryblades supported by the carriage and movable therewith transversely ofthe scrap, whereby wear on said cutter blades is distributed over aconsiderable portion thereof so that the frequency of resharpening saidcutter blades is minimized.

3. The combination with a side-trimming shear effective to cut on anelongated piece of scrap from material ted thereto, of means .iorchopping said scrap into smaller pieces comprising a carriage movabletransversely of the line of travel of the scrap ejected by said shear,coacting fixed and rotary cutter blades supported by said carriage andmovable therewith transversely of the scrap, whereby wear on the cutterblades is distributed over a considerable portion of the length thereofso that the frequency of resharp-- ening said cutter blades isminimized, the parts being so constructed and arranged that the rotaryblade of the scrap chopper turns on an axis substantially parallel withthe plane of the material being cut.

ARTHUR ROBERT CARR.

